William e



W..R. PATTERSON.

METHOD 0F MAKING TELEGRAPH CABLES. No. 309,244. Patented Deo. 16, 1884.

1 lli .s ....ff.

(No Model.)

UNITED STATES PATENT OFFICE,

'M/'ILLIAM E. .]?ATTEBSON, OE CHICAGO, ILLINOIS, ASSIGNOR 'IO THE TEST- ERN ELECTRIC COMPANY, OE SAME ILACE.

METHOD OF MAKING TELEGRAPH-CABLES.

SPECIFICATION forming part of Letters Patent No. 309,244, dated December 16, 1884.

Application tiled Juin` El, JSS-l. (No model) To LIZ whom/ it 7mo/j concer/L:

Be it known that I, vVILLixn It. Parri-znsoN, a citizen ofthe United States, residing at Chicago, in the county ot' Cook and Slate of Illinois, have invented a certain new and useful Improvement in Methods of Making Telegraph-Cables, (Case 33,) of which the following is a full, clear, concise, and exact description, reference being had to the` accompanying drawings, forming a part of this specification.

My invention relates to flexible telegraphcables in which a core ot' insulated conductors is drawn into a tube, and protected by au insulating substance forced in hot among the conductors.

Heretofore lead pipes have been used in the manufacture ot' telegraph-cables; but cables having lead-pipe coverings are very heavy, especially for aerial purposes. Vtubber tubes have therefore been employed to protect the cover of aerial cables, but no attempt has been made to fill the interstiees among the conductors ofthe core with an insulating substance for thc purpose of preventing` moisture from penetrating` to the wires in case the tube proves defective.

My invention consists in filling the elastic tube, after the core of conductors has been drawn in, with an insulating substance, which is forced in hot. The elastic pipe is expanded by the pressure of the melted insulating substance as it is forced in; but as the substance y shrinks in cooling, the tube which has been stretched by the pressure of the melted insulatinginatcrial shrinks to correspond, and thus all the interstiees are filled with a solid insulating substance, preferably paratline-wax.

I preferably braid a loose serving about the rubber tube, so as to limit its expansion and prevent the pressure of the melted insulating substance from bursting the said elastic tube. After the p'arafine or other substance has shrunk I wind the pipe with strong serving,

so as to prevent expansion and strengthen the cable.

My invention is illustrated inthe accompanying drawings, in which- Figure l is a longitudinal section of a cable embodying my improvements. Fig. 2 is a transverse section thereof.

The core ol' conductors c consists of any deu sired number of copper wires insulated by 'fibrous material and twisted together in the form shown. The pipe bis a tube of soft rubber. hot under pressure and allowed to cool. The tube is expanded by the pressure of the hot par-affine, 'but as the paral'line shrinks in cooling, the tube also shrinks, so that all interstiees are completely filled with solid paraiiine or the insulating` wax or composition. The braiding LL' is preferably braided loosely about the pipe before the filling is forced into the pipe, thus limiting its expansion. After the parat-'line and pipe have shrunk, the serving e is wound tightly about the cable, thus strengthening the cable and preventing the pipe from expanding to any great extent in ease the paraftine should again become warm or hot.

I claim as my invention and desire to secure by Letters PatentrIhe method ot' insulating the conductors of xa telegraph-cable, which consists in surrounding the core with an elastic pipe and forcing therein a melted insulating substance and allowing the insulating substance to cool within the elastic pipe, whereby the said pipe is y caused to shrink as the insulating substance shrinks in cooling, substantially as and for the purpose Specified.

In witness whereof I hereunto subscribe my name this 5th day of June, A. D. 1884.

IVILLIAM E. PATTERSON \Vitnesses:

EoneE I). Bxn'rox, Josnrrt JENNING The paraffine c isv forced into the pipe t- 

